APA
Hawkins Gordon, Zimring Franklin E, . (1991). Pornography in free society. Cambridge: Cambridge University Press.
Chicago
Hawkins Gordon, Zimring Franklin E, . 1991. Pornography in free society. Cambridge: Cambridge University Press.
Harvard
Hawkins Gordon, Zimring Franklin E, . (1991). Pornography in free society. Cambridge: Cambridge University Press.
MLA
Hawkins Gordon, Zimring Franklin E, . Pornography in free society. Cambridge: Cambridge University Press. 1991.